摘要
高饱和磁通密度锰锌铁氧体在清洁能源、LED照明、混合动力及电动汽车等新兴市场有重要的应用前景。要满足不断发展的市场要求,高饱和磁通密度锰锌铁氧体必须在保持高饱和磁通密度(Bs)之外、同时具有较低的损耗(Pcv)和较好的温度稳定性。目前,商业化的材料主要关注的是Bs(100℃)为450m T左右的材料,而实验室内则对Bs(100℃)大于500m T的材料进行了较多的研究。要提高Bs,主要通过增加材料中Fe2O3的含量和提高材料的密度,在这个方面现在的很多研究已经可以实现。要将Bs(100℃)大于500m T的材料大批量生产,主要的问题是降低损耗。降低损耗一般通过添加杂质和控制烧成工艺实现,此外还应考虑原材料的粒度、比表面积等粉体特性和造粒工艺。在保证Bs(100℃)的基础上改善材料的温度稳定性主要是引入Ni O等实现的。
MnZn ferrites with high saturation flux density has promising application prospect in clean energy, LED lighting, hybrid electric vehicle （HEV） and electric vehicle （EV）. In keeping with the advance of more compact and more power-saving electronic equipment, the demand is increasing for high-saturation-flux-density （Bs）, lower core loss （Pcv） and better temperature stability. At present, the commercial products mainly concern Bs of about 450mT at 100℃, while the researches in lab focus on the ferrite with Bs of about 500mT at 100℃. Excess of Fe203 and high density are necessary to obtain high Bs and the goal has been reached. The obstacle to mass product is the high core loss accompanying with high Bs. The main approaches to decrease core loss are optimizing additives and sintering technology. Besides, the particle size and specific surface area of raw materials and the granulation process are taken into account. The ferrites with high Curie temperature such as NiFe2O4 are introduced to improve the temperature stability.
出处
《磁性材料及器件》
CAS
2016年第3期64-70,共7页
Journal of Magnetic Materials and Devices
关键词
锰锌铁氧体
饱和磁通密度
损耗
温度稳定性
烧成工艺
MnZn ferrite
saturation flux density
power loss
temperature stability
sintering
